Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbcb33c8784bec6…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 10:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 833b62e0b6337ebc06754f090df9bff8 SHA-1: 7dfe646b3a3f8a1066e2364c03ad2252e2a11a0c SHA-256: 0fbcb33c8784bec6b274a189ec1d986436ddaa2c0ec6b9c6a5ba675e9df42b1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech support scams. Embedded JavaScript streams were also detected, which could be used to exploit vulnerabilities or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://littlepearlspublishing.in/data/eimages/file/46507468051.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f06a717b---34200448191.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c33cd607---nakodiveruwuwewixazuto.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c868d2b420---44104148331.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/37399821688.pdf
    • http://wonikqnc.com/upload/editor/file/1623952684.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0eb849e3---peguzedusuda.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/46485f7a685adf34ad9f8b2aa8331bf8/vifasodewawemezaf.pdf
    • http://capmar.eu/userfiles/file/luperavomawumipunadez.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3fd847c7d42fe1a30d4058e4f7032592/41194353479.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/rarqcaalcdvgddpg51qo4o0i02/11513383079.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1682cb627d---loleribiwikade.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7720c7bd88---20275097862.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/31378467878.pdf
    • http://446888.top/userfiles/file/jukuwukilizav.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061700552973499.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503194746869275.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28c564664---27599113006.pdf
    • https://tepihtrava.rs//files/kukebonini.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/figodul.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3c2712a0856be1ef1afde7695a6aef14/49945991773.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/kafezokota.pdf
    • http://ghalemdi.com/userfiles/file/50566679702.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9f540c4e20d2383206b58825d87c6d6/43711278909.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3212d24c---98347718853.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=soil+and+water+conservation+district+supervisor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010418.bin
eb51644750c31a35ebc5561f070ac29594361f56d5cf9206ff2a0504de1ba71c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 17488 bytes
font_01_sfnt_off0001316d.bin
4441a9e69decb8b5559b0c66703c369c47fbf291cb7398b802b93477a1862fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 10836 bytes
font_02_sfnt_off00014a95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 16792 bytes